Zoom lens with multi-layers for illumination

ABSTRACT

The zoom lens with multi-layers for illumination mainly comprises a lens body that has at least one free curved surface on a side. The free curved surface is designed to be multiple zoom curved surfaces with multiple layers. Besides, one side of the curved surface is designed to be oblique and the other side is arc surface. Hence, the curved surface can be divided into multiple patterns with multiple focuses through the various combinations of complex free curved surfaces. Furthermore, the control of the luminance and projection angle can be achieved by the various combinations of zooming and focusing on the curved surfaces,

FIELD OF THE INVENTION

The present invention relates to zoom lens with multi-layers forillumination, particularly the zoom lens with plurality of curvedsurfaces able to modify the luminance and the angle of the lightprojection and to reduce the thickness and the area of the lens. Hence,it is able to reduce the production cost, to improve the lightprojection distance and range and luminance level and to control oflight projection angles.

DESCRIPTION OF THE PRIOR ART

Commonly, LED has been used to replace most of the bulbs, such asvehicle lamp, street lamp, flashlight and searchlight for friendlyenvironmental purpose. However, the projection area of LED is smaller asshown in FIG. 1. In order to enhance the luminance and the projectionarea of the lighting devices, either a hemispheric lens 11 is arrangedin front of a LED 10 and a light reflector 12 is disposed along LED 10,or, the numbers of LED are increased. However, either way is complex andwould cause the production cost increasing. Furthermore, they are onlyable to change the projection either distance or range due to the waysof increasing light projections. In addition, the light is based on thescattering radiation which the light projection cannot be affected. As aresult, the centre of the projected light is much brighter thansurrounding area. Moreover, the hemispheric lens requires greaterthickness and larger area in order to achieve certain projection range.

Furthermore, the light of the prior lens is bright on the centre butdark surround so the light can't be balanced, and the light projectioncan't be changed to control brightness and angle of the light by user'sdemand.

SUMMARY OF THE PRESENT INVENTION

Accordingly, the primary object of the present invention is to provide azoom lens with multi-layers for illumination capable of controlling thebrightness and projecting angle, distance and the area with thinner lensand lower production costs.

To achieve the objectives, the zoom lens with multi-layers comprises alens body that includes at least one free curved surface on a side. Thefree curved surface is bored with plural zoom curved surfaces withmulti-layers. One side of the zoom curved surface is designed to be anoblique, and the other side of the zoom curved surface is designed to bean arc surface. Therefore, the body of the zoom lens comprises numbersof complex free curved surfaces. In order to achieve the requiredlighting efficacy, the zoom curved surface can be designed as multiplepatterns so that the light can be refracted and focused by the varietycombinations of the patterns due to multiple focuses of the patterns.

A flat surface is formed to a side of the lens body opposite to the zoomcurved surface.

The number and the size of the plurality of the patterns on the lens areformed able to be symmetric vertically and horizontally.

The number and the size of the plurality of the patterns on the lens areformed able to be symmetric vertically but not horizontally.

The number and the size of the plurality of the patterns on the lens areformed able to be symmetric d horizontally but not vertically. The lensbody is disposed with at least two free curved surfaces whichrespectively has a plurality of patterns.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a prior art of lens and lamp.

FIG. 2 is a perspective view showing a first embodiment of the presentinvention.

FIG. 3 is a front view showing the first embodiment of the presentinvention.

FIG. 4 is a side view showing the first embodiment of the presentinvention.

FIG. 5 is a top view showing the first embodiment of the presentinvention.

FIG. 6 is a side exploded schematic view showing the light projection ofthe first embodiment of the present invention.

FIG. 7 is a top exploded schematic view showing the light projection ofthe first embodiment of the present invention.

FIG. 8 is a diagram showing an illumination distribution of the firstembodiment of the present invention.

FIG. 9 is a front view showing the two free curved surfaces of thesecond embodiment of the present invention.

FIG. 10 is a front view showing the curved surface of the thirdembodiment of the present invention able to be symmetric horizontallybut not vertically.

FIG. 11 is a front view showing the curved surface of the fourthembodiment of the present invention able to be symmetric vertically butnot horizontally.

DETAILED DESCRIPTION OF THE INVENTION

In order that those skilled in the art can further understand thepresent invention, a description will be provided in the following indetails. However, these descriptions and the appended drawings are onlyused to cause those skilled in the art to understand the objects,features, and characteristics of the present invention, but not to beused to confine the scope and spirit of the present invention defined inthe appended claims.

FIGS. 1 to 5 the embodiment of the zoom lens with multi-layers forillumination according to the present invention is illustrated. The zoomlens with multi-layers for illumination comprises a lens body 2. Thelens body 2 has at least one free curved surface 21. The free curvedsurface 21 includes a plurality of zoom curved surfaces 22 with multiplelayers. The zoom curved surface 22 consists of an oblique plane 220 onone side and arc surface 221 on the other side. A flat surface 23 isformed to an opposite side of the free curved surface 21 on the lensbody 2. As a result, the zoom lens with multi-layers for illumination isformed completely.

The operation of the preferable embodiment of the present invention isillustrated in FIGS. 6 to 8. The light source 3 is disposed behind theflat surface 23 of the lens body 2. The light projection 30 from thelight source 3 will be refracted and focused thru the plurality of thezoom curved surfaces 22 of the lens body 2. Thus, the present inventioncan increase the projection range and brightness, balance light andcontrol the projection angle. Moreover, the present invention candecrease the thickness of the lens body 2 so that the production cost isable to be reduced.

The number of the free curved surfaces 21 of the present invention canbe determined by the demands of the luminance. Referring to FIG. 9, thelens body 4 can have at least two free curved surfaces 41. Moreover,each free curved surface 41 has a plurality of zoom curved surfaces 42.Through the arrangement of the number and the location of the zoomcurved surfaces 42 of the lens body 4, different level of the luminancecan be achieved. Referring to FIG. 9, the number of the zoom curvedsurfaces 42 on the middle position is more than the number of zoomcurved surface 42 on the both sides of the lens body 3. As a result, thelight on the middle will be bright but the light on the both sides willbe dark. In addition, through the both vertically and horizontallysymmetrical arrangement of number and size of the zoom curved surfaces22 of the free curved surface 21 of the lens body 2, the balancing ofbrightness can be achieved. Besides that, in order to control theprojection angle, the arrangement of the zoom curved surface 22 of thelens body 2 can be designed irregularly, i.e. horizontally symmetric butnot vertically (FIG. 10) or vertically symmetric but not horizontally(FIG. 11). It is designed to enhance the luminance by more numbers ofthe zoom curved surface 22 on the lens body 2. On the contrary, lessnumber of the curved surfaces 22 on the lens body 2 is designed to lowerthe lamination. Due to the light refraction of the present invention,when the light enters into different materials, it will result indifferent index of refraction. The curved surface can be divided intomultiple patterns through the different combinations of free curvedsurfaces. Furthermore, through the various combinations of zooming andfocusing on the curved surfaces, the control of the luminance andprojection angle can be achieved.

The present invention can be used to enhance the light source of variouslight devices, such as vehicle lamp, street lamp, flashlight orprojection light.

The present invention is thus described, it will be obvious that thesame may be varied in many ways. Such variations are not to be regardedas a departure from the spirit and scope of the present invention, andall such modifications as would be obvious to one skilled in the art areintended to be included within the scope of the following claims.

What is claimed is:
 1. A zoom lens with multi-layers for illuminationcomprising: a lens body having at least one free curved surface on aside of the lens body; the free curved surface designed as multiple zoomcurved surfaces with multiple layers; one side of the zoom curvedsurface is designed to be oblique and the other side is arc surface. 2.The zoom lens with multi-layers for illumination as claimed in claimed1, wherein a flat surface is formed to an opposite side of the freecurved surface on the lens body.
 3. The zoom lens with multi-layers forillumination as claimed in claimed 1, wherein the number and size of theplurality of the curved surfaces of the free curved surface are designedable to be symmetric vertically and horizontally.
 4. The zoom lens withmulti-layers for illumination as claimed in claimed 1, wherein thenumber and size of the plurality of the curved surfaces on the freecurved surface are designed able to be symmetric horizontally but notvertically.
 5. The zoom lens with multi-layers for illumination asclaimed in claimed 1, wherein the number and size of the plurality ofthe curved surfaces on the free curved surface are designed able besymmetric vertically but not horizontally.
 6. The zoom lens withmulti-layers for illumination as claimed in claimed 1, wherein the lensbody comprises at least two free curved surfaces; each free curvedsurface includes the plurality of the curved surface.